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Garage door insulation can last anywhere from 20 to 100 years depending on the type of insulation. Cellulose has the shortest lifespan coming in at between 20 and 30 years, while spray foam, mineral wool, and fiberglass can last between 80 and 100 years with proper maintenance. 

Humidity plays a role in how long more susceptible insulation materials—like fiberglass—last. Once fiberglass batts reach the 15-year mark, you'll need to routinely inspect your insulation to ensure that it is in mint order.

Since garage door torsion springs have tightly wound coils under massive tension, they can cause serious injury while attempting to service them. A broken spring can also cause the garage to close rapidly, causing injuries. That’s why any adjustments or replacements of a torsion spring should only be conducted by a trained professional.

Extension springs are just as dangerous as torsion springs—especially when they break. These springs can become projectiles and may cause serious injury or property damage.

If you enjoy tinkering with cars, woodworking, or exercising in your garage, then a garage heater may be worth it to you. If your garage is used mainly for storage, you may opt to skip installing a garage heater. If you live somewhere with favorable weather year-round, you can probably go without one as well. But for most homeowners, a garage heater is a good investment and makes the garage a more comfortable place to spend time.

The best method for painting a garage door depends on the door's design and the finish you want to achieve. For the most professional-looking finish, especially on doors with panels or intricate details, a paint sprayer is an excellent choice. It can easily get into hard-to-reach places and provide a smooth, even coat.

If you don't have a sprayer, or if your door is flat, a combination of a roller and a brush is the most effective approach. Use a roller for the large, flat sections to cover the area quickly and efficiently. For the best results, experts recommend a roller with a nap between ⅜ and ¾ inches thick; natural fibers can also help ensure an even coat.

A brush is essential for handling the finer details. Use it to paint grooves, angles, small panels, and the edges of the door where you need more control.

Regardless of the tools you use, it's a good idea to step back after the main application to review your work and use a detail brush to touch up any missed spots.